EP0661084B1 - Zweiteiliger Golfball - Google Patents

Zweiteiliger Golfball Download PDF

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Publication number
EP0661084B1
EP0661084B1 EP94309867A EP94309867A EP0661084B1 EP 0661084 B1 EP0661084 B1 EP 0661084B1 EP 94309867 A EP94309867 A EP 94309867A EP 94309867 A EP94309867 A EP 94309867A EP 0661084 B1 EP0661084 B1 EP 0661084B1
Authority
EP
European Patent Office
Prior art keywords
golf ball
core
piece golf
weight
parts
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP94309867A
Other languages
English (en)
French (fr)
Other versions
EP0661084A2 (de
EP0661084A3 (de
Inventor
Seiichiro Endo
Kuniyasu Horiuchi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sumitomo Rubber Industries Ltd
Original Assignee
Sumitomo Rubber Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=18433117&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0661084(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Sumitomo Rubber Industries Ltd filed Critical Sumitomo Rubber Industries Ltd
Publication of EP0661084A2 publication Critical patent/EP0661084A2/de
Publication of EP0661084A3 publication Critical patent/EP0661084A3/de
Application granted granted Critical
Publication of EP0661084B1 publication Critical patent/EP0661084B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B37/00—Solid balls; Rigid hollow balls; Marbles
    • A63B37/0003—Golf balls
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B37/00—Solid balls; Rigid hollow balls; Marbles
    • A63B37/0003—Golf balls
    • A63B37/0023—Covers
    • A63B37/0029—Physical properties
    • A63B37/0031—Hardness
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B37/00—Solid balls; Rigid hollow balls; Marbles
    • A63B37/0003—Golf balls
    • A63B37/0038—Intermediate layers, e.g. inner cover, outer core, mantle
    • A63B37/004—Physical properties
    • A63B37/0046—Deflection or compression
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B37/00—Solid balls; Rigid hollow balls; Marbles
    • A63B37/0003—Golf balls
    • A63B37/007—Characteristics of the ball as a whole
    • A63B37/0072—Characteristics of the ball as a whole with a specified number of layers
    • A63B37/0074—Two piece balls, i.e. cover and core

Definitions

  • the present invention relates to a two-piece golf ball. More particularly, it relates to a two-piece golf ball which is superior in shot feel and attains high launch angle.
  • a two-piece golf ball has widely been used by many golfers, e.g., amateur golfers and professional golfers, because of long flight distance obtained and excellent flight performances.
  • its shot feel is hard in comparison with a conventional thread-wound golf ball and it is thus a desiratum to improve this feature.
  • the main object of the present invention is to provide a two-piece golf ball having excellent control properties, which is easily flown and is easily stopped by a short iron, by making the shot feel of the two-piece golf ball similar to that of thread-wound golf balls and increasing the launch angle.
  • EP-A-0545541 discloses a two piece golf ball comprising a core and a cover as described in the preamble of claim 1.
  • the present invention provides a two-piece golf ball comprising a core and a cover covering the core, wherein the core is made of a rubber composition comprising 100 parts by weight of a base rubber, from 20 to 45 parts by weight of a co-crosslinking agent and from 0.3 to 5.0 parts by weight of an organic peroxide, wherein the hardness of the core is within the range of from 40 to 57 in the vicinity of its center and from 70 to 95 in the vicinity of its surface, the difference between the hardness in the vicinity of the surface and that in the vicinity of the center is within the range of from 28 to 40, the hardness being measured by means of JIS-C type hardness tester, and wherein the compression deformation amount formed between an initial loading of 10 kg and a final loading of 130 kg is from 3.1 to 4.5
  • the present invention also provides a method of making a two-piece golf ball as herein described comprising:
  • the core of the golf ball of the present invention is made of a rubber composition comprising a base rubber, a co-crosslinking agent and an organic peroxide.
  • the base rubber in the present invention there can be used a natural rubber and/or synthetic rubber which have hitherto been used for a two-piece core.
  • a natural rubber and/or synthetic rubber which have hitherto been used for a two-piece core.
  • cis-1,4-polybutadiene rubber having at least 40% of a cis-structure is preferred.
  • natural rubber, styrene-butadiene rubber, EPDM, etc. may be suitable formulated in the polybutadiene rubber.
  • the co-crosslinking agent may be specifically limited and examples thereof include metal salts of unsaturated carboxylic acids, having 3 to 8 carbon atoms (e.g. acrylic acid, methacrylic acid, etc). Among them, zinc acrylate is particularly preferred.
  • the amount of the co-crosslinking agent is 20 to 45 parts by weight based on 100 parts by weight of the base rubber. When the amount is smaller than 20 parts by weight, the hardness of the golf ball is insufficient, which results in an excessively heavy and inferior feel. Further, the durability also is inferior. On the other hand, when it exceeds 45 parts by weight, it is too hard, which results in an inferior feel.
  • organic peroxide examples include dicumyl peroxide, di-t-butyl peroxide and the like. Among them, dicumyl peroxide is particularly preferred.
  • the amount is 0.3 to 5.0 parts by weight, preferably 0.5 to 3.0 parts by weight, based on 100 parts by weight of the base rubber. When the amount is smaller than 0.3 parts by weight, the hardness of the golf ball is insufficient, which results in a heavy and inferior feel. On the other hand, when the amount exceeds 5.0 parts by weight, it becomes too hard, which results in an inferior feel.
  • additives such as fillers, antioxidants, etc.
  • the filler include zinc oxide, barium sulfate, etc and the amount thereof varies depending on the specific gravity and size of the cover and core, and is not specifially limited. Normally, it is 10 to 40 parts by weight based on 100 parts by weight of the base rubber.
  • the core of the two-piece golf ball can be formed by kneading the rubber composition sufficiently, followed by vulcanization molding in a die.
  • the hardness of the core of the present invention (measured by JIS-C type hardness tester) is within a range of 40 to 57 in the vicinity of the center and 70 to 95 in the vicinity of the surface (within 3 mm away from the surface) and, further, the difference in hardness in the vicinity of the surface and that in the vicinity of the center is within a range of 28 to 40.
  • the hardness of the core in the vicinity of the center is smaller than 40, the durability is inferior, it is too soft and the shot feel becomes heavy, which results in an inferior feel.
  • the shot feel becomes hard, which results in an inferior feel.
  • the hardness of the core in the vicinity of the surface is smaller than 70, the shot feel becomes heavy, which results in an inferior feel.
  • the shot feel becomes hard.
  • the difference in hardness in the vicinity of the surface and that in the vicinity of the center exceeds 40, the durability becomes inferior.
  • the compression deformation amount formed between initial loading (10kg) and final loading (130 kg) is 3.1 to 4.5mm.
  • the compression deformation amount is smaller than 3.1mm, the shot feel is hard, which results in an inferior feel.
  • it exceeds 4.5mm it is too soft, which results in a heavy feel. Further, the golf ball cannot be flown.
  • vulcanization conditions it is conducted by setting a vulcanization temperature so that a vulcanization peak is obtained within 5 to 20 minutes from the vulcanization initiation time, the time when a die is closed being taken as the vulcanization initiation time.
  • the vulcanization reaction is conducted for 20 to 50 minutes from the vulcanization initiation time.
  • the vulcanization temperature is from 130 to 180°C.
  • a two-piece golf ball is obtained by covering the core thus obtained with a cover.
  • the cover is formed by covering the core with a cover material obtained by suitably formulating inorganic oxides such as titanium oxide (TiO 2 ), etc., into a resin component which is mainly composed of an ionomer resin, if necessary.
  • a cover material obtained by suitably formulating inorganic oxides such as titanium oxide (TiO 2 ), etc., into a resin component which is mainly composed of an ionomer resin, if necessary.
  • an injection molding method is normally used, however, it is not specifically limited.
  • the resin component of the cover which is mainly composed of an ionmer resin
  • the ionomer resin may be used alone as the resin component, or resins such as polyethylene, polyamide, etc., or rubbers may be suitably formulated into the ionomer resin as the main component.
  • the thickness of the cover is not specifically limited, but it is normally 1.4 to 2.7 mm.
  • a dimple may be formed, if necessary. Further, if necessary, a paint or marking may be applied after cover molding.
  • the present invention it is possible to make the shot feel of the golf ball softer by increasing the difference between the surface hardness and center hardness. Also, an effect can be obtained such that the launch angle becomes large at the time of hitting and the golf ball is easily flown and, further, the golf ball is easily stopped by a short iron.
  • the components of the core formulation shown in Tables 1 and 2 were kneaded to prepare a rubber composition, which was subjected to vulcanization molding in a die under the vulcanizing conditions shown in Tables 1 and 2 to give a core, respectively.
  • the hardness was measured at the center of the core, locations which are respectively 5mm, 10mm and 15mm away from the center and the surface of the core, using a JIS-C type hardness tester. Further, the compression strength of the core was also measured.
  • the core thus obtained was coated with an ioner resin of the cover formulation shown in Tables 1 and 2 by an injection molding.
  • the stiffness and the thickness of the cover were shown in Tables 1 and 2.
  • BR-01 in the core formulation is a butadiene rubber having a cis-1,4-content of (96%) manufactured by Japan Synthetic Rubber Co., Ltd.
  • Hi-milane 1605" and “Hi-milane 1706” are ionomer resins commercially available from Mitsui Polychemical Co., Ltd.
  • the hardness (PGA indication) and the durability index as well as the flight distance, the launch angle and the shot feel (evaluation of feelng) obtained by hitting with respective clubs were evaluated.
  • the durability index was measured as follows. That is, a golf ball was hit repeatedly at a head speed of 45 m/second using a swing robot manufactured by True Temper Co. and the number of times until breakage, cracking, etc. is generated was measured and, further, the resulting value was indicated as an index in case of the value of the golf ball of Example 2 being 100.
  • the flight distance and the launch angle were measured by hitting a golf ball using a commercially available swing robot manufactured by True Temper Co. equipped with a No. 1 wood club, No. 5 iron club and No 9 iron club. The feeling was determined by 20 top professional golfers.
  • the evaluation results of the golf balls of the above Exmaples and Comparative Examples are shown in Tables 3 and 4.

Landscapes

  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Claims (7)

  1. Zweiteiliger Golfball, umfassend einen Kern und eine Ummantelung zum Umhüllen des Kerns, wobei der Kern aus einer Kautschukmasse besteht, die 100 Gewichtsteile eines Grundkautschuks, 20 bis 45 Gewichtsteile eines Co-Vernetzungsmittels und 0,3 bis 5,0 Gewichtsteile eines organischen Peroxids umfasst, wobei die Härte des Kerns im Bereich von 40 bis 57 in der Nähe seines Zentrums und im Bereich von 70 bis 95 in der Nähe seiner Oberfläche liegt, wobei die Härte mit einem Härtetestgerät vom JIS-C-Typ gemesen wird und wobei das Ausmaß der Druckverformung, das zwischen einer Anfangslast von 10 kg und einer Endlast von 130 kg ensteht, 3,1 bis 4,5 mm beträgt, dadurch gekennzeichnet, dass der Unterschied zwischen der Härte in der Nähe der Oberfläche und derjenigen in der Nähe des Zentrums im Bereich von 28 bis 40 liegt.
  2. Zweiteiliger Golfball nach Anspruch 1, wobei der Grundkautschuk ein natürlicher Kautschuk und/oder ein synthetischer Kautschuk ist.
  3. Zweiteiliger Golfball nach Anspruch 1 oder 2, wobei der Grundkautschuk cis-1,4-Polybutadienkautschuk mit wenigstens 40% einer cis-Struktur ist.
  4. Zweiteiliger Golfball nach einem der Ansprüche 1 bis 3, wobei das Co-Vernetzungsmittel Metallsalze von ungesättigten Carbonsäuren, vorzugsweise einwertige oder zweiwertige Metallsalze von ungesättigten Carbonsäuren mit 3 bis 8 Kohlenstoffatomen umfasst.
  5. Zweiteiliger Golfball nach einem der Ansprüche 1 bis 4, wobei das organische Peroxid Dicumylperoxid, Di-t-butylperoxid oder ein Gemisch davon umfasst.
  6. Zweiteiliger Golfball nach einem der Ansprüche 1 bis 5, wobei die Kautschukmasse ferner Füllstoffe und/oder Antioxidantien umfasst.
  7. Verfahren zur Herstellung eines zweiteiligen Golfballs, umfassend einen Kern und eine Ummantelung zum Umhüllen des Kerns nach einem der Ansprüche 1 bis 6, wobei das Verfahren umfasst:
    (i) Bereitstellen einer Kautschukmasse, umfassend 100 Gewichtsteile eines Grundkautschuks, 20 bis 45 Gewichtsteile eines Co-Vernetzungsmittels und 0,3 bis 5,0 Gewichtsteile eines organischen Peroxids;
    (ii) Kneten der Kautschukmasse;
    (iii) Formen eines Kerns durch Vulkanisierformen der geknetenen Kautschukmasse in einer Pressform, wobei die Vulkanisation bei einer Vulkanisiertemperatur durchgeführt wird, so dass innerhalb von 5 bis 20 Minuten seit dem Vulkanisierbeginn das Vulkanisiermaximum erreicht wird, die Vulkanisation 20 bis 50 Minuten durchgeführt wird und die Vulkanisiertemperatur 130 bis 180°C beträgt; und
    (iv) Umhüllen des Kerns aus Schritt (iii) mit einer Ummantelung.
EP94309867A 1993-12-28 1994-12-28 Zweiteiliger Golfball Expired - Lifetime EP0661084B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP35377293 1993-12-28
JP5353772A JP3040300B2 (ja) 1993-12-28 1993-12-28 ツーピースゴルフボール
JP353772/93 1993-12-28

Publications (3)

Publication Number Publication Date
EP0661084A2 EP0661084A2 (de) 1995-07-05
EP0661084A3 EP0661084A3 (de) 1995-11-22
EP0661084B1 true EP0661084B1 (de) 2000-05-03

Family

ID=18433117

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94309867A Expired - Lifetime EP0661084B1 (de) 1993-12-28 1994-12-28 Zweiteiliger Golfball

Country Status (5)

Country Link
US (1) US5645496A (de)
EP (1) EP0661084B1 (de)
JP (1) JP3040300B2 (de)
AU (1) AU681464B2 (de)
DE (1) DE69424268T2 (de)

Families Citing this family (41)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08164226A (ja) * 1994-10-14 1996-06-25 Bridgestone Sports Co Ltd ゴルフボール
JPH10314340A (ja) * 1997-05-16 1998-12-02 Sumitomo Rubber Ind Ltd ソリッドゴルフボール
US6093357A (en) * 1998-03-26 2000-07-25 Acushnet Company Methods for making multi-layer golf balls using rigid uncrosslinked shells
JPH11290479A (ja) 1998-04-07 1999-10-26 Sumitomo Rubber Ind Ltd ツーピースソリッドゴルフボール
JP3656808B2 (ja) * 1999-03-03 2005-06-08 ブリヂストンスポーツ株式会社 ソリッドゴルフボール及びその選定方法
JP2000245869A (ja) * 1999-03-03 2000-09-12 Bridgestone Sports Co Ltd ゴルフボール
JP2000288121A (ja) * 1999-04-01 2000-10-17 Bridgestone Sports Co Ltd ソリッドゴルフボール
JP4213307B2 (ja) 1999-08-19 2009-01-21 Ｓｒｉスポーツ株式会社 ツーピースソリッドゴルフボール
US6441578B1 (en) 1999-09-16 2002-08-27 Delphi Technologies, Inc. Method and apparatus for torque linearization in an electric power steering system
JP4486241B2 (ja) * 1999-09-30 2010-06-23 Ｓｒｉスポーツ株式会社 マルチピースソリッドゴルフボール
JP3685248B2 (ja) 2000-02-08 2005-08-17 ブリヂストンスポーツ株式会社 マルチピースソリッドゴルフボール
JP2001259080A (ja) 2000-03-15 2001-09-25 Bridgestone Sports Co Ltd ツーピースソリッドゴルフボール
JP2002000765A (ja) 2000-06-26 2002-01-08 Bridgestone Sports Co Ltd ゴルフボール
JP2002000764A (ja) 2000-06-26 2002-01-08 Bridgestone Sports Co Ltd ゴルフボール
JP2002126129A (ja) 2000-08-15 2002-05-08 Bridgestone Sports Co Ltd ツーピースゴルフボール
JP3655817B2 (ja) 2000-10-06 2005-06-02 住友ゴム工業株式会社 ツーピースソリッドゴルフボール
JP4573469B2 (ja) * 2001-06-01 2010-11-04 Ｓｒｉスポーツ株式会社 ゴルフボール
JP2003000762A (ja) 2001-06-21 2003-01-07 Bridgestone Sports Co Ltd ゴルフボール
US20030032502A1 (en) * 2001-07-12 2003-02-13 Lee Eui Mun Golf ball having improved core rubber composition
JP2003126297A (ja) * 2001-10-23 2003-05-07 Bridgestone Sports Co Ltd ゴルフボール
JP4082895B2 (ja) 2001-12-04 2008-04-30 Ｓｒｉスポーツ株式会社 ソリッドゴルフボール
JP2003164545A (ja) * 2001-12-04 2003-06-10 Sumitomo Rubber Ind Ltd ソリッドゴルフボール
JP2003180879A (ja) 2001-12-21 2003-07-02 Sumitomo Rubber Ind Ltd ツーピースソリッドゴルフボール
US6887166B2 (en) 2002-02-15 2005-05-03 Qi Yu Golf ball
JP4073689B2 (ja) * 2002-03-14 2008-04-09 Ｓｒｉスポーツ株式会社 ゴルフボール
US7008334B2 (en) * 2004-04-14 2006-03-07 Bridgestone Sports Co., Ltd. Golf ball
US7077764B2 (en) * 2004-04-14 2006-07-18 Bridgestone Sports Co., Ltd. Golf ball
US20080274833A1 (en) * 2006-03-07 2008-11-06 Brian Comeau Golf Ball Compositions
US8034861B2 (en) * 2006-03-07 2011-10-11 Acushnet Company Golf ball compositions
US8034863B2 (en) * 2006-03-07 2011-10-11 Acushnet Company Golf ball compositions
US8030386B2 (en) * 2006-03-07 2011-10-04 Acushnet Company Golf ball compositions
US20080268982A1 (en) * 2006-03-07 2008-10-30 Brian Comeau Golf Ball Compositions
US8030384B2 (en) * 2006-03-07 2011-10-04 Acushnet Company Golf ball compositions
US8034862B2 (en) * 2006-03-07 2011-10-11 Acushnet Company Golf ball compositions
US8030387B2 (en) * 2006-03-07 2011-10-04 Acushnet Company Golf ball compositions
US8030385B2 (en) * 2006-03-07 2011-10-04 Acushnet Company Golf ball compositions
US8030383B2 (en) * 2006-03-07 2011-10-04 Acushnet Company Golf ball compositions
JP2012020118A (ja) * 2010-06-16 2012-02-02 Mizuno Corp ゴルフボール
JP5331756B2 (ja) * 2010-06-29 2013-10-30 ダンロップスポーツ株式会社 ゴルフボール
JP2010269184A (ja) * 2010-09-07 2010-12-02 Bridgestone Sports Co Ltd ゴルフボール
JP5545345B2 (ja) * 2012-11-22 2014-07-09 ブリヂストンスポーツ株式会社 ゴルフボール

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JPS59194760A (ja) * 1983-04-21 1984-11-05 住友ゴム工業株式会社 スリ−ピ−スソリツドゴルフボ−ル
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JPS62181069A (ja) * 1986-02-04 1987-08-08 キャスコ株式会社 ソリツドスリ−ピ−スゴルフボ−ル
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JP2680405B2 (ja) * 1989-04-04 1997-11-19 住友ゴム工業株式会社 ラージサイズのスリーピースソリッドゴルフボール
JP2916310B2 (ja) * 1991-11-01 1999-07-05 住友ゴム工業株式会社 ツーピースゴルフボール
DE69325738T2 (de) * 1992-04-28 2000-01-27 Sumitomo Rubber Industry Ltd., Kobe Fester Golfball

Also Published As

Publication number Publication date
US5645496A (en) 1997-07-08
AU681464B2 (en) 1997-08-28
JP3040300B2 (ja) 2000-05-15
AU8172694A (en) 1995-07-06
DE69424268D1 (de) 2000-06-08
EP0661084A2 (de) 1995-07-05
JPH07194732A (ja) 1995-08-01
EP0661084A3 (de) 1995-11-22
DE69424268T2 (de) 2000-11-30

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